4 March 2019

Why me?

  • Environmental Research Group
  • PhD
  • The London Hybrid Exposure Model
  • A Game of Thrones

Why, and why now?

  • Exposure to particles on subway systems > important

  • Seaton et al 2005, but …
    • Tox. mechanisms
    • Susceptible populations
    • Analytical techniques

What we tried to do?

  • Measure variations in PM2.5 between lines and stations
  • Characterise the chemical composition
  • Calculate calibration factors for optical instruments
  • Provide a spatially resolved dataset for future analysis

Campaign One

  • COPD Study
  • 22 journeys alternating between Oxford Street / Hyde Park
  • TSI AM510 SidePak for PM2.5
  • Philips Aerasense for ultrafine particle number and mean particle diameter

Campaign Two

  • Same equipment
  • 31 hours
  • All lines
  • 89% of stations (NE Central, SW Piccadilly)

Calibration

  • Hampstead Station platform v. overground
  • One month
  • Filters v. TSI AM510 SidePak


Characterisation

  • Something here from Dave.

Passenger-weighted stations

  • 2015 tap in/tap out, Underground performance report
  • Annual in/out for each station
  • Mean PM2.5 measured at each station
  • Passenger rank * air quality rank = passenger-weighted ranking

Spatial representation of the tube

Results

The Victoria Line

Environment comparisons

Line averages

Station depth 1

Station depth 2

Depth on the Central Line



Passenger-weighted stations

Conclusions

What next?

The end

Public health risks from respirable particles on the 'London Underground' metro network

Smith, J.D., Green, D., Loxham, M. Priestman, M., Tremper, A., Mudway, I., Fuller, G., Nicolosi, E., Barratt, B.M.



james.d.smith@kcl.ac.uk

TheRealJimShady